# -*- coding: utf-8 -*-
from __future__ import division, unicode_literals
import logging
from ..htmlhelpers import *
from ..messages import *

def brokenLinks(doc):
    '''
    Check every external link in the document to make sure it returns a 2XX or 3XX response.
    Auto-skips mailto: links.
    '''
    if not doc.md.complainAbout['broken-links']:
        return
    from ..requests import requests

    say("Checking links, this may take a while...")
    logging.captureWarnings(True) # Silence the requests library :/
    for el in findAll("a", doc):
        href = el.get('href')
        if not href or href[0] == "#":
            # Local link
            continue
        if href.startswith("mailto:"):
            # Can't check mailto links
            continue
        try:
            res = requests.get(href, verify=False)
        except Exception as e:
            warn("The following link caused an error when I tried to request it:\n{0}\n{1}", outerHTML(el), e)
            continue
        if res.status_code >= 400:
            warn("Got a {0} status when fetching the link for:\n{1}", res.status_code, outerHTML(el))
    say("Done checking links!")
